21210430650203 has 2 divisors, whose sum is σ = 21210430650204. Its totient is φ = 21210430650202.

The previous prime is 21210430650191. The next prime is 21210430650259. The reversal of 21210430650203 is 30205603401212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210430650203 - 2¹⁶ = 21210430584667 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210430650503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605215325101 + 10605215325102.

It is an arithmetic number, because the mean of its divisors is an integer number (10605215325102).

Almost surely, 2^{21210430650203} is an apocalyptic number.

21210430650203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210430650203 is an equidigital number, since it uses as much as digits as its factorization.

21210430650203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

The spelling of 21210430650203 in words is "twenty-one trillion, two hundred ten billion, four hundred thirty million, six hundred fifty thousand, two hundred three".